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6y=4y+40
We move all terms to the left:
6y-(4y+40)=0
We get rid of parentheses
6y-4y-40=0
We add all the numbers together, and all the variables
2y-40=0
We move all terms containing y to the left, all other terms to the right
2y=40
y=40/2
y=20
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